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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 1
 8
 2

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Electrical Machines
Which machine is used for battery charging?

 DC series generator.
 Compounded DC generator.
 None of these.
 DC shunt generator.

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Electrical Machines
An unexcited single phase synchronous motor is

  universal motor.
 reluctance motor.
 repulsion motor.
 AC series motor.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 component of armature mmf along field axis
 uneven air-gap length
 magnetic saturation in half of the field pole
 non-sinusoidal nature of armature mmf

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Electrical Machines
Wave winding is prefered for which of the following rating?

 high current and low voltage
 low current and low voltage
 high current and high voltage
 low current and high voltage

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Electrical Machines
Armature reaction depends on which of the following?

 power factor of load
 both 1 and 2
None of these
 magnitude of load current

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